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a tial/α‑al 2 o 3 Preparation method of nanocomposite

A nanocomposite material, nanotechnology, applied in the field of preparation of metal matrix nanocomposite materials

Active Publication Date: 2017-02-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem that nanoparticles are easy to form large-scale agglomeration and clusters in liquid metal due to their high specific surface energy

Method used

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  • a tial/α‑al <sub>2</sub> o <sub>3</sub> Preparation method of nanocomposite
  • a tial/α‑al <sub>2</sub> o <sub>3</sub> Preparation method of nanocomposite
  • a tial/α‑al <sub>2</sub> o <sub>3</sub> Preparation method of nanocomposite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] α-Al 2 o 3 Nanoparticles were weighed at a ratio of 1wt.%, and packaged with aluminum foil for later use. Put the pre-prepared ingot of Ti43at%Al master alloy into the crucible, wrap the wrapped α-Al 2 o 3 The nanoparticles are put into the distribution hopper. Vacuum the furnace to 6.0×10 -2 Pa, filled with high-purity Ar to 400Pa. Increase the electromagnetic power to 95kw to completely melt the master alloy. Reduce the power to 35kw to keep the alloy liquid level basically flat, and tilt the distribution hopper to distribute nano α-Al 2 o 3particles. After 90% of the nanoparticles are completely involved in the alloy liquid, increase the power to 65kw. After there are no floating particles on the alloy liquid surface, increase the power to 105kw. After 10 minutes of electromagnetic stirring, stop the power and cool down with the furnace. Take out the ingot and turn it over and put it into the crucible again, and vacuum the furnace to 6.0×10 -2 Pa, fill wit...

Embodiment 2

[0025] α-Al 2 o 3 The nanoparticles are weighed according to the proportion of 8wt.%, and are packaged with aluminum foil for later use. Put the pre-prepared composition of Ti45at.%Al10at.%Nb master alloy ingot into the crucible, wrap the wrapped nano-α-Al 2 o 3 The pellets are put into the cloth hopper. Vacuum the furnace to 8.0×10 -3 Pa, filled with high-purity Ar to 450Pa. Increase the electromagnetic power to 100kw to completely melt the master alloy. Reduce the power to 40kw to keep the alloy liquid level basically flat, and tilt the distribution hopper to distribute nanoparticles. After 90% of the nanoparticles are completely involved in the alloy liquid, increase the power to 70kw. After there are no floating particles on the alloy liquid surface, increase the power to 110kw. After 9 minutes of electromagnetic stirring, stop the power and cool down with the furnace. Take out the ingot and turn it over and put it into the crucible again, and vacuum the furnace to...

Embodiment 3

[0027] α-Al 2 o 3 Nanoparticles are weighed according to the ratio of 15wt.%, and packaged with aluminum foil for later use. Put the pre-prepared ingot of Ti47at%Al master alloy into the crucible, and wrap the wrapped nano-α-Al 2 o 3 The pellets are put into the cloth hopper. Vacuum the furnace to 5.5×10 -3 Pa, filled with high-purity Ar to 500Pa. Increase the electromagnetic power to 105kw to completely melt the master alloy. Reduce the power to 45kw to keep the alloy liquid level basically flat, and tilt the distribution hopper to distribute nanoparticles. After 90% of the nanoparticles are completely involved in the alloy liquid, increase the power to 75kw. After there are no floating particles on the alloy liquid surface, increase the power to 115kw. After 8 minutes of electromagnetic stirring, stop the power and cool down with the furnace. Take out the ingot and turn it over and put it into the crucible again, and vacuum the furnace to 5.5×10 -3 Pa, fill with ar...

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Abstract

The invention relates to a preparation method of a nanometer alpha-Al2O3 reinforced TiAl-based composite material. The method includes process control of the form and the temperature of TiAl melt before addition of nanometer alpha-Al2O3 particles, process control of uniform rolling of nano-particles in the TiAl melt without adsorption to the wall of a crucible in the addition process, and electromagnetic stirring process. The method comprises the following steps: preparing nano-particles, putting TiAl mother alloy in a crucible, carrying out vacuum pumping, and filling high purity argon for protection; improving the electromagnetic induction power to completely melt the mother alloy, and reducing the power to make the surface of the molten alloy planar; pouring the nano-particles into the surface of the molten alloy, improving the power after 90% of the nano-particles are completely rolled in the molten alloy until no nano-particles float on the surface of the molten alloy, improving the power, stirring, shutting the power, and carrying out furnace cooling; and overturning cast ingots, putting the ingots into the crucible, carrying out vacuum pumping, introducing highly pure argon, fast improving the power to 105-115kw, electromagnetically stirring for 8-10min, stopping the power, and carrying out furnace cooling. The nanometer alpha-Al2O3 uniformly dispersed and distributed TiAl-based composite material is prepared through the above process design.

Description

technical field [0001] The invention relates to the technical field of preparation of metal-based nanocomposites, more specifically a TiAl intermetallic compound based nano-α-Al 2 o 3 A method for preparing a composite material for a reinforcing phase. By adding nanometer α-Al to TiAl alloy melt 2 o 3 According to its wettability, a TiAl-based composite material with nanoparticles uniformly dispersed in the matrix was obtained by using an appropriate electromagnetic stirring process. Background technique [0002] Due to its low density, high specific strength, high specific stiffness and excellent high-temperature oxidation resistance, TiAl-based intermetallic compounds have great application potential in high-temperature structural components such as aerospace and automobiles, and are expected to replace high-density nickel-based Superalloys further improve engine mobility and reduce greenhouse gas emissions. Metal matrix composites (MMCs) usually can significantly imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C14/00C22C21/00C22C32/00C22C30/00
Inventor 林均品张志勇梁永锋张来启
Owner UNIV OF SCI & TECH BEIJING